Monitors keep resetting

Hi all
having trouble with my MacPro (Intel, early 2008)
I'm running 2 monitors (22" and 19") from a standard Radeon HD 2600 card - problem is that both monitors simultaneously will often lose signal and blink on and off for a few seconds (black, blue screen) and then reset. This may happen 2 or 3 times before it stabelizes again (resolution remains the same). Often happens not long after waking from sleep. Also now find that one of the monitors often does not return (black blocks all over it) and I have to restart.
Have reset the PRAM - not sure what to do now  =(
Graphics card is just over 12 months old (previous one was replaced with a similar problem but resolution kept changing)
any thoughts would be greatly appreciated
thanks
steve

resetting SMC and running AHT could find the very your problem.
-- kaz-k

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